You can now upgrade a retro Casio watch with Bluetooth, step tracking, and games

The DIY version of the Ollee Watch one, which requires you to already have one of six different supported Casio watch models ...
Liliputing

Ollee Watch brings smartwatch features to the Casio F-91W with a mainboard replacement

The Ollee Watch features an ARM Cortex-M4/M0+ low-power processor with support for Bluetooth Low Energy and a programmable NTAG213 NFC tag (although this is said to only be compatible with the F-91W ...
Liliputing

casio f-91w

The Casio F-91W is a classic digital wristwatch that’s been in constant production since it was first released in 1989. With a $20 starting price, the watch offers a water resistant design, an LED ...